| 摘要 |
PCT No. PCT/CH92/00027 Sec. 371 Date Sep. 7, 1993 Sec. 102(e) Date Sep. 7, 1993 PCT Filed Feb. 11, 1992 PCT Pub. No. WO92/14575 PCT Pub. Date Sep. 3, 1992.Electrical discharge machining of a positively charged workpiece with a negatively charged wire electrode (2) by a pulse generator (3), with water as the dielectric fluid, generates a stray current known as "leakage current" that leads to a form of corrosion on the surface of the workpiece known as "anodic dissolution". A secondary circuit fed by a generator (5) and located between the workpiece and auxiliary electrodes (6), creates an equalizing current that cancels the leakage current and diminishes or eliminates anodic dissolution of the workpiece (1). The auxiliary electrodes (6) can be mounted on machining heads (7) with a non-conductive material (8) between the auxiliary electrodes.
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